1. Department of Urology, The First Affiliated Hospital of Xi’an Medical University, Xi’an, Shaanxi Province, People’s Republic of China
2. School of General Medicine of Xi’an Medical University, Xi’an, Shaanxi Province, People’s Republic of China
3. Department of Human Anatomy, Histology and Embryology, School of Basic Medical Sciences, Xi’an Jiaotong University Health Science Center, Xi’an, Shaanxi Province, People’s Republic of China